Référence de la classe ChaCha20

Graphe d'héritage de ChaCha20:

Fonctions membres publiques
	encrypt ($plaintext)
	decrypt ($ciphertext)
	setNonce ($nonce)
Fonctions membres publiques hérités de Salsa20
	usesNonce ()
	setKey ($key)
	setNonce ($nonce)
	setCounter ($counter)
	encrypt ($plaintext)
	decrypt ($ciphertext)
Fonctions membres publiques hérités de StreamCipher
	__construct ()
	usesIV ()
Fonctions membres publiques hérités de SymmetricKey
	__construct ($mode)
	setIV ($iv)
	enablePoly1305 ()
	setPoly1305Key ($key=null)
	setNonce ($nonce)
	setAAD ($aad)
	usesIV ()
	usesNonce ()
	getKeyLength ()
	getBlockLength ()
	getBlockLengthInBytes ()
	setKeyLength ($length)
	setKey ($key)
	setPassword ($password, $method='pbkdf2',... $func_args)
	encrypt ($plaintext)
	decrypt ($ciphertext)
	getTag ($length=16)
	setTag ($tag)
	enablePadding ()
	disablePadding ()
	enableContinuousBuffer ()
	disableContinuousBuffer ()
	isValidEngine ($engine)
	setPreferredEngine ($engine)
	getEngine ()
	getMode ()

Fonctions membres protégées
	isValidEngineHelper ($engine)
	setup ()
Fonctions membres protégées hérités de Salsa20
	createPoly1305Key ()
	setup ()
	setupKey ()
	encryptBlock ($in)
	decryptBlock ($in)
	poly1305 ($ciphertext)
Fonctions membres protégées hérités de SymmetricKey
	getIV ($iv)
	openssl_translate_mode ()
	isValidEngineHelper ($engine)
	setEngine ()
	encryptBlock ($in)
	decryptBlock ($in)
	setupKey ()
	setup ()
	pad ($text)
	unpad ($text)
	createInlineCryptFunction ($cipher_code)
	poly1305 ($text)

Fonctions membres protégées statiques
static	quarterRound (&$a, &$b, &$c, &$d)
static	doubleRound (&$x0, &$x1, &$x2, &$x3, &$x4, &$x5, &$x6, &$x7, &$x8, &$x9, &$x10, &$x11, &$x12, &$x13, &$x14, &$x15)
static	salsa20 ($x)
Fonctions membres protégées statiques hérités de Salsa20
static	leftRotate ($x, $n)
static	quarterRound (&$a, &$b, &$c, &$d)
static	doubleRound (&$x0, &$x1, &$x2, &$x3, &$x4, &$x5, &$x6, &$x7, &$x8, &$x9, &$x10, &$x11, &$x12, &$x13, &$x14, &$x15)
static	salsa20 ($x)
Fonctions membres protégées statiques hérités de SymmetricKey
static	safe_intval ($x)
static	safe_intval_inline ()
static	nullPad128 ($str)

Attributs protégés
	$cipher_name_openssl = 'chacha20'
Attributs protégés hérités de Salsa20
	$p1 = false
	$p2 = false
	$key_length = 32
	$enbuffer
	$debuffer
	$counter = 0
	$usingGeneratedPoly1305Key = false
Attributs protégés hérités de StreamCipher
	$block_size = 0
Attributs protégés hérités de SymmetricKey
	$mode
	$block_size = 16
	$key = false
	$iv = false
	$encryptIV
	$decryptIV
	$continuousBuffer = false
	$enbuffer
	$debuffer
	$cfb_init_len = 600
	$changed = true
	$nonIVChanged = true
	$engine
	$cipher_name_mcrypt
	$cipher_name_openssl
	$cipher_name_openssl_ecb
	$inline_crypt
	$explicit_key_length = false
	$aad = ''
	$newtag = false
	$oldtag = false
	$poly1305Key
	$usePoly1305 = false
	$nonce = false

Fonctions membres privées
	encrypt_with_libsodium ($plaintext)
	decrypt_with_libsodium ($ciphertext)

Membres hérités additionnels
Champs de données hérités de Salsa20
const	ENCRYPT = 0
const	DECRYPT = 1
Champs de données hérités de SymmetricKey
const	MODE_CTR = -1
const	MODE_ECB = 1
const	MODE_CBC = 2
const	MODE_CFB = 3
const	MODE_CFB8 = 7
const	MODE_OFB8 = 8
const	MODE_OFB = 4
const	MODE_GCM = 5
const	MODE_STREAM = 6
const	MODE_MAP
const const	ENGINE_INTERNAL = 1
const	ENGINE_EVAL = 2
const	ENGINE_MCRYPT = 3
const	ENGINE_OPENSSL = 4
const	ENGINE_LIBSODIUM = 5
const	ENGINE_OPENSSL_GCM = 6
const	ENGINE_MAP

Documentation des fonctions membres

decrypt()

decrypt

(

$ciphertext

)

Decrypts a message.

$this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)). At least if the continuous buffer is disabled.

Voir également

::encrypt()

self::crypt()

Paramètres

string

$ciphertext

Renvoie

string $plaintext

Références ChaCha20\decrypt_with_libsodium(), et ChaCha20\setup().

decrypt_with_libsodium()

decrypt_with_libsodium (   $ciphertext )

private

Decrypts a message with libsodium

Voir également

self::decrypt()

Paramètres

string

$ciphertext

Renvoie

string $text

Références SymmetricKey\$aad, SymmetricKey\$key, SymmetricKey\$newtag, SymmetricKey\$nonce, $params, et Salsa20\poly1305().

Référencé par ChaCha20\decrypt().

doubleRound()

static doubleRound ( &  $x0, &  $x1, &  $x2, &  $x3, &  $x4, &  $x5, &  $x6, &  $x7, &  $x8, &  $x9, &  $x10, &  $x11, &  $x12, &  $x13, &  $x14, &  $x15  )

staticprotected

The doubleround function

Paramètres

int	$x0	(by reference)
int	$x1	(by reference)
int	$x2	(by reference)
int	$x3	(by reference)
int	$x4	(by reference)
int	$x5	(by reference)
int	$x6	(by reference)
int	$x7	(by reference)
int	$x8	(by reference)
int	$x9	(by reference)
int	$x10	(by reference)
int	$x11	(by reference)
int	$x12	(by reference)
int	$x13	(by reference)
int	$x14	(by reference)
int	$x15	(by reference)

encrypt()

encrypt

(

$plaintext

)

Encrypts a message.

Voir également

::decrypt()

self::crypt()

Paramètres

string

$plaintext

Renvoie

string $ciphertext

Références ChaCha20\encrypt_with_libsodium(), et ChaCha20\setup().

encrypt_with_libsodium()

encrypt_with_libsodium (   $plaintext )

private

Encrypts a message with libsodium

Voir également

self::encrypt()

Paramètres

string

$plaintext

Renvoie

string $text

Références SymmetricKey\$aad, SymmetricKey\$key, SymmetricKey\$nonce, $params, et Salsa20\poly1305().

Référencé par ChaCha20\encrypt().

isValidEngineHelper()

isValidEngineHelper (   $engine )

protected

Test for engine validity

This is mainly just a wrapper to set things up for ::isValidEngine()

Voir également

__construct()

Paramètres

int

$engine

protected

Renvoie

bool

Références SymmetricKey\$continuousBuffer, SymmetricKey\$engine, et counter.

quarterRound()

static quarterRound ( &  $a, &  $b, &  $c, &  $d  )

staticprotected

The quarterround function

Paramètres

int	$a
int	$b
int	$c
int	$d

Références $b, et $c.

salsa20()

static salsa20 (   $x )

staticprotected

The Salsa20 hash function function

On my laptop this loop unrolled / function dereferenced version of parent::salsa20 encrypts 1mb of text in 0.65s vs the 0.85s that it takes with the parent method.

If we were free to assume that the host OS would always be 64-bits then the if condition in leftRotate could be eliminated and we could knock this done to 0.60s.

For comparison purposes, RC4 takes 0.16s and AES in CTR mode with the Eval engine takes 0.48s. AES in CTR mode with the PHP engine takes 1.19s. Salsa20 / ChaCha20 do not benefit as much from the Eval approach due to the fact that there are a lot less variables to de-reference, fewer loops to unroll, etc

Paramètres

string

$x

setNonce()

setNonce

(

$nonce

)

Sets the nonce.

Paramètres

string

$nonce

Références SymmetricKey\$nonce, et SymmetricKey\setEngine().

setup()

setup ( )

protected

Setup the self::ENGINE_INTERNAL $engine

(re)init, if necessary, the internal cipher $engine

_setup() will be called each time if $changed === true typically this happens when using one or more of following public methods:

• setKey()
• setNonce()
• First run of encrypt() / decrypt() with no init-settings

Voir également

self::setKey()

self::setNonce()

self::disableContinuousBuffer()

Références Salsa20\$counter, SymmetricKey\$key, SymmetricKey\$nonce, Salsa20\$p2, et Salsa20\createPoly1305Key().

Référencé par ChaCha20\decrypt(), et ChaCha20\encrypt().

Documentation des champs

$cipher_name_openssl

$cipher_name_openssl = 'chacha20'

protected

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La documentation de cette classe a été générée à partir du fichier suivant :

• phpseclib/phpseclib/phpseclib/Crypt/ChaCha20.php